Constructing the Fluorine-Containing Structures for Excellent Tribological Properties of Degradable Poly(Hexahydrotriazine)S

Abstract

In light of the weak covalent bonding of reversible bonds in biodegradable thermosetting resins, limits their applications in the field of tribology. Herein, we synthesize degradable poly(hexahydrotriazine)s (PHTs) by introducing trifluoromethyl (-CF3) groups into the main chain of an aromatic diamine, achieving simultaneous improvement of degradability and high friction performance. Notably, fluorinated PHT resins exhibited excellent anti-wear performance with wear rates decreasing by 78.6% owing to the large steric hindrance effect and strong electronegativity brought about by -CF3, which increases the rigidity and heat resistance of the PHTs molecules, thereby enabling it to effectively resist frictional heat generated during the friction process. This contributes to its practical application of energy conservation and protective metal anti-wear coatings in the tribological industry.

Keywords: fluorinated poly(hexahydrotriazine)s, Mechanical properties, tribological properties, degradation